CN204697021U - A kind of multimedia active loundspeakers control circuit - Google Patents
A kind of multimedia active loundspeakers control circuit Download PDFInfo
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- CN204697021U CN204697021U CN201520342586.XU CN201520342586U CN204697021U CN 204697021 U CN204697021 U CN 204697021U CN 201520342586 U CN201520342586 U CN 201520342586U CN 204697021 U CN204697021 U CN 204697021U
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Abstract
The utility model provides a kind of multimedia active loundspeakers control circuit, comprise: preamplifying circuit and rear class power amplification circuit, described preamplifying circuit comprises audio input interface and volume tone control circuit, the output of described audio input interface connects volume tone control circuit, the output of described volume tone control circuit connects rear class power amplification circuit, and the output of described rear class power amplification circuit connects output loudspeaker.The utility model, by arranging Dolby circuit, limits input impedance, avoids preamplifying circuit to be in high impedance status, suppresses alternating current impression signal, improves the signal to noise ratio of system.Rear class power amplification circuit amplifies the audio signal of input for receiving described prime and amplifies, and drives, realize the control exported audio signal to the readiness control circuit of rear class amplification work.
Description
Technical field
The utility model relates to a kind of sound equipment, is specifically related to a kind of multimedia active loundspeakers control circuit.
Background technology
Sound equipment is well received by consumers as music player devices, at present, the known sound equipment of people mainly realizes its playing function by being connected with various audiogenic device, such as be connected with VCD, MP3, computer, but this sound equipment generally all needs to connect external power source, carry inconvenience, therefore inconvenience and play whenever and wherever possible with oneself, if will carry out outside playing, need to carry power supply separately, or look for the civil power position carrying out transferring to play, make scope of application critical constraints.At present for the Audio power amplifier chip of the overwhelming majority, load for loudspeaker has certain requirement, in order to realize better audio frequency output quality, when the loudspeaker of the little load resistance of material, more easily occur that loudspeaker load damages comparatively greatly the problem of loudspeaker, and then occur that big current returns string and damages audio power chip, like this by the range of application of restricting audio power amplifier chip greatly.
Utility model content
In order to overcome above-mentioned prior art Problems existing, the utility model provides a kind of multimedia active loundspeakers control circuit.
The technical scheme that the utility model is taked is: a kind of multimedia active loundspeakers control circuit, it is characterized in that, comprise: preamplifying circuit and rear class power amplification circuit, described preamplifying circuit comprises audio input interface and volume tone control circuit, the output of described audio input interface connects volume tone control circuit, the output of described volume tone control circuit connects rear class power amplification circuit, and the output of described rear class power amplification circuit connects output loudspeaker.
Further, described volume tone control circuit is by operational amplifier IC1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and electric capacity C2 forms, described audio input interface is connected with one end of described input resistance R1, the other end of described resistance R1 is connected with resistance R2 and is accessed the negative input of operational amplifier IC1 afterwards, the electrode input end ground connection of described operational amplifier, resistance R4 is set between the negative input of described operational amplifier and output, the output of described operational amplifier is connected with described rear class power amplification circuit with adjustable resistance VR1 by resistance R5.
Further, the input of described volume tone control circuit also arranges the Dolby circuit be made up of electric capacity C1 and resistance R6, and described electric capacity C1 is connected with the output of audio input interface with the one end after resistance R6 parallel connection, other end ground connection.
Further, described rear class power amplification circuit comprises readiness control circuit and audio signal output circuit, and the output of described readiness control circuit connects audio signal output circuit, and the output of described audio signal output circuit connects loudspeaker.
Further, described readiness control circuit comprises triode Q1, resistance R12, resistance R13, resistance R14, resistance R15 and electric capacity C7, the collector electrode of described triode Q1 is connected by the control end of resistance with rear class amplifying circuit, described resistance R15 and electric capacity C7 connects, one end connects power supply, other end ground connection, the collector electrode of described triode Q1 is connected with power supply by resistance R12, the base stage of described triode Q1 is connected with power supply by divider resistance R13, one end of described resistance R14 is connected with the base stage of triode Q1, other end ground connection, the grounded emitter of described triode Q1.
Further, the negative-feedback circuit that described audio signal output circuit comprises audio-frequency power amplifier IC2 and is made up of resistance R8, R9, described readiness control circuit is connected with described audio-frequency power amplifier, and described audio-frequency power amplifier arranges negative-feedback circuit.
The beneficial effects of the utility model are: the utility model, by arranging Dolby circuit, limits input impedance, avoid preamplifying circuit to be in high impedance status, suppress alternating current impression signal, improve the signal to noise ratio of system.Rear class power amplification circuit amplifies the audio signal of input for receiving described prime and amplifies, and drives, realize the control exported audio signal to the readiness control circuit of rear class amplification work.
Accompanying drawing explanation
A kind of multimedia active loundspeakers control circuit structure chart that Fig. 1 provides for the utility model.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
See Fig. 1, it is a kind of multimedia active loundspeakers control circuit structure chart that the utility model provides.
As shown in Figure 1, a kind of multimedia active loundspeakers control circuit, it is characterized in that, comprise: preamplifying circuit and rear class power amplification circuit, described preamplifying circuit comprises audio input interface and volume tone control circuit, the output of described audio input interface connects volume tone control circuit, and the output of described volume tone control circuit connects rear class power amplification circuit, and the output of described rear class power amplification circuit connects output loudspeaker.
Further, described volume tone control circuit is by operational amplifier IC1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and electric capacity C2 forms, described audio input interface is connected with one end of described input resistance R1, the other end of described resistance R1 is connected with resistance R2 and is accessed the negative input of operational amplifier IC1 afterwards, the electrode input end ground connection of described operational amplifier, resistance R4 is set between the negative input of described operational amplifier and output, the output of described operational amplifier is connected with described rear class power amplification circuit with adjustable resistance VR1 by resistance R5.
Further, the input of described volume tone control circuit also arranges the Dolby circuit be made up of electric capacity C1 and resistance R6, and described electric capacity C1 is connected with the output of audio input interface with the one end after resistance R6 parallel connection, other end ground connection.
In the utility model embodiment, when sound equipment is closed, audio input interface is unsettled, is in high impedance input state, and the ac signal of now prime induction is delivered to late-class circuit and amplified, loudspeaker are made to occur stronger noise, by arranging Dolby circuit, input impedance being limited, avoiding preamplifying circuit to be in high impedance status, alternating current impression signal is suppressed, improves the signal to noise ratio of system.
Further, described rear class power amplification circuit comprises readiness control circuit and audio signal output circuit, and the output of described readiness control circuit connects audio signal output circuit, and the output of described audio signal output circuit connects loudspeaker.
Further, described readiness control circuit comprises triode Q1, resistance R12, resistance R13, resistance R14, resistance R15 and electric capacity C7, the collector electrode of described triode Q1 is connected by the control end of resistance with rear class amplifying circuit, described resistance R15 and electric capacity C7 connects, one end connects power supply, other end ground connection, the collector electrode of described triode Q1 is connected with power supply by resistance R12, the base stage of described triode Q1 is connected with power supply by divider resistance R13, one end of described resistance R14 is connected with the base stage of triode Q1, other end ground connection, the grounded emitter of described triode Q1.
Further, the negative-feedback circuit that described audio signal output circuit comprises audio-frequency power amplifier IC2 and is made up of resistance R8, R9, described readiness control circuit is connected with described audio-frequency power amplifier, and described audio-frequency power amplifier arranges negative-feedback circuit.
In the utility model embodiment, rear class amplifying circuit amplifies the audio signal of input for receiving described prime and amplifies, and is driven, realize the control exported audio signal by the readiness control circuit of power control circuit to rear class amplification work.
Above the utility model is described in detail, but the utility model is not limited to above-mentioned execution mode, in the ken that those of ordinary skill in the art possess, can also makes a variety of changes under the prerequisite not departing from the utility model aim.Do not depart from design of the present utility model and scope can make many other and change and remodeling.Should be appreciated that the utility model is not limited to specific execution mode, scope of the present utility model is defined by the following claims.
Claims (6)
1. a multimedia active loundspeakers control circuit, it is characterized in that, comprise: preamplifying circuit and rear class power amplification circuit, described preamplifying circuit comprises audio input interface and volume tone control circuit, the output of described audio input interface connects volume tone control circuit, the output of described volume tone control circuit connects rear class power amplification circuit, and the output of described rear class power amplification circuit connects output loudspeaker.
2. a kind of multimedia active loundspeakers control circuit according to claim 1, it is characterized in that, described volume tone control circuit is by operational amplifier IC1, resistance R1, resistance R2, resistance R3, resistance R4, resistance R5 and electric capacity C2 forms, described audio input interface is connected with one end of described input resistance R1, the other end of described resistance R1 is connected with resistance R2 and is accessed the negative input of operational amplifier IC1 afterwards, the electrode input end ground connection of described operational amplifier, resistance R4 is set between the negative input of described operational amplifier and output, the output of described operational amplifier is connected with described rear class power amplification circuit with adjustable resistance VR1 by resistance R5.
3. a kind of multimedia active loundspeakers control circuit according to claim 1, it is characterized in that, the input of described volume tone control circuit also arranges the Dolby circuit be made up of electric capacity C1 and resistance R6, described electric capacity C1 is connected with the output of audio input interface with the one end after resistance R6 parallel connection, other end ground connection.
4. a kind of multimedia active loundspeakers control circuit according to claim 1, it is characterized in that, described rear class power amplification circuit comprises readiness control circuit and audio signal output circuit, the output of described readiness control circuit connects audio signal output circuit, and the output of described audio signal output circuit connects loudspeaker.
5. a kind of multimedia active loundspeakers control circuit according to claim 4, it is characterized in that, described readiness control circuit comprises triode Q1, resistance R12, resistance R13, resistance R14, resistance R15 and electric capacity C7, the collector electrode of described triode Q1 is connected by the control end of resistance with rear class amplifying circuit, described resistance R15 and electric capacity C7 connects, one end connects power supply, other end ground connection, the collector electrode of described triode Q1 is connected with power supply by resistance R12, the base stage of described triode Q1 is connected with power supply by divider resistance R13, one end of described resistance R14 is connected with the base stage of triode Q1, other end ground connection, the grounded emitter of described triode Q1.
6. a kind of multimedia active loundspeakers control circuit according to claim 4, it is characterized in that, the negative-feedback circuit that described audio signal output circuit comprises audio-frequency power amplifier IC2 and is made up of resistance R8, R9, described readiness control circuit is connected with described audio-frequency power amplifier, and described audio-frequency power amplifier arranges negative-feedback circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520342586.XU CN204697021U (en) | 2015-05-25 | 2015-05-25 | A kind of multimedia active loundspeakers control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520342586.XU CN204697021U (en) | 2015-05-25 | 2015-05-25 | A kind of multimedia active loundspeakers control circuit |
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| Publication Number | Publication Date |
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| CN204697021U true CN204697021U (en) | 2015-10-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520342586.XU Active CN204697021U (en) | 2015-05-25 | 2015-05-25 | A kind of multimedia active loundspeakers control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672960A (en) * | 2018-02-01 | 2019-04-23 | 中山市悦辰电子实业有限公司 | A kind of power amplifier and its muting control circuit |
-
2015
- 2015-05-25 CN CN201520342586.XU patent/CN204697021U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109672960A (en) * | 2018-02-01 | 2019-04-23 | 中山市悦辰电子实业有限公司 | A kind of power amplifier and its muting control circuit |
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